I was hoping to have a module that puts a white noise generator on a 3.5mm extension cord. This is meant to be used with phones. A battery would work, but I would be limited in size with about a AAA batteryJacks by themselves have no ability to generate power. Power comes from a battery or from a power supply derived from the AC mains. The circuit above has a single output and no input. As such it may not be suitable for an inline application. Maybe you could elaborate on your idea so we have a better idea what you have in mind.
Yes, I intend for this to be a small self contained circuit connected by the 3.5mm jack.To clarify, you are asking about a small circuit, self-contained and battery powered, that generates a white noise electrical signal, with enough current to drive headphones directly, connected to a 3.5 mm headphone jack.
If yes, what are the headphones? Do you know the DC resistance or AC impedance? There is a big difference in the output signal power required for studio-grade over-the-ear headphones versus $1.99 ear buds.
Is this an acoustic masking application?
If yes, the "right" way is to have two independent circuits, one for each ear, so the left and right signals are not identical.
1.5 V severely limits your circuit options, output power, and output fidelity (yes, noise has fidelity). Any way to fit in a single 9 V transistor radio battery? What are the max size limits of the box the circuit fits in?
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by Jeff Child